Improvement in tuck-creasers for sewing-machines



CHARLES E. ROBINSON. Improvement in Tuck-Creasers for Sewing-Machines.NO, 1141604. PatentedMay 9,1871.

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Letters Patent No. 114,604, dated May 9, 1871.

IMPROVEMENT lN TUCK-CREASERS FOR SEWING-MACHINES.

The Schedule referred to in these Letters Patent and making part of thesame.

To all whom it may concern.-

I, CHARLES E. ROBINSON, of Boston, in the county of Sufi'olk and Stateof Massachusetts, have invented certain new and useful Improvements inTucker's for Sewing-lVIachine, of which the following is aspecification.

Nature and Object of the I iwcnt'ion.

The said device or apparatus is designed for creasing cloth in theproper lines to form tucks or plaits preparatory tobeing sewed.

The nature of my invention consists in the peculiar construction andarrangement of the several operative parts, as hereinafter described,the object being to render the device simple in construction andpositive and effective in operation.

Description of the Accompanying Drawing.

Figure l is a perspective view of a tuck-creasing apparatus embodying myinvention.

Figure 2 is aview, on an enlarged scale, of the male die-creaser.

Figure 3 is an end view, on an enlarged scale, show- A ing the creasingdevice in elevation.

Figure 4 is a side view of a part of the apparatus, showing themechanism for actuating 0r elevating and depressing the female die orgrooved roller.

In the said drawing- A and B denote the base-plate, which may be of anydesirable length, the same having an arm, 0, projecting from one sidethereof, the said arm having a slot, 0, made through it, by means ofwhich and a screw the said plate may be secured to the top plate of asewing-machine.

- One side of the said arm is formed with a plain vertical face, 0'',disposed at a right angle to the baseplate, and serves as an abutment orguide for one edge of the cloth.

D is a head-block, which is attached to a slide-bar, D, so applied tothe base-plate as to be capable of being freely moved longitudinallytherein.

On the outer end of the said bar D, and transversely thereof, a maledie-creaser, (l, is formed, the same consisting of a short knife-edgeprojection standing out of parallelism with the face of the guide (3",or slightly inclined thereto, as clearly shown in'the prolonged line atcl in fig. 1.

H is a set-screw, by which the block D may be fixedin any desiredposition.

E is a bar or arm, which is pivoted by a pivot, P, to the head-block, asshown in figs. 1 and 4.

K is a. rocker-lever, which is aflixed to the headblock by means of apin or fulcrum, S, on which it freely turns.

The said lever has an eccentric or cam-groove, b 6, into which-a stud,c, on the rear end of the arm E, projects, so that (by the conjointaction of the said; groove and stud) if the lever K be thrown upward theadjacent end E" of the arm E will be depressed, and

consequently the other end of such arm be elevated, as shown fig. 1.

Furthermore, there is pivoted to the said arm E a presser-bar or apron,F, one of whose pivots is shown at f in said latter figure,-the said baror swinging apron being so disposed that its lower edge shall alwaysrest on the cloth or fabric, whether of greater or'lesser thickness.

The said bar or apron has formed on its upper or beveled surface a scaleof divisions denoting inches and fractions thereof, by which thecreasing-dies may be set or gauged at any desired distance from theguide G".

L is a spring, which is arranged upon the arm E,

and has its two arms resting upon the presser-bar or apron, the tensionof the said spring being such as to maintain the resser-bar in contactwith the fabric,

whether it be the finest muslin or the coarsest linen.

The object of the spring presser-bar or apron is to so press upon thefabric of greater or lesser thickness as to preserve it, as it passesunder the bar, from wrink-' ling or puckering, and by maintaining asteady and uniform pressure to give a proper tension to the cloth orfabric while being creased or creased and sewed.-

N is a grooved wheel or female die-creaser, which is pivoted to the armor link M, which, in turn, is pivoted to the arm E, as shown in fig. 3.The said link or arm is not arranged at a right angle with itscarrying-arm, or in parallelism with the guide 0, but is inclinedthereto, such inclination corresponding with the line of convergence ofthe lower member d, as shown in fig. 1. i

The said wheel N is disposed directly over the male die-creaser orknife-edge d, and acts conjointly therewith in forming a crease in thecloth.

Q is a spring coiled around a rod, M, which extends vertically upwardfrom the arm E through a slot in the arm M.

This rod has a thumb-nut, M, by which the tension or pressure of thewheel upon the fabric may be duly the same being in exact coincidencewith the increment of convergence of the male die-creaserd in relationto the said guide.

The object of so disposing the male and female diecreasers with respectto the guide is to compensate for as I am aware that such, per se, isnot new.

the frictional tendency of the creasers to draw the-cloth or fold awayfrom the guide while the fabric is passing through the device, andthereby maintain it in its true path of movement.

Thus it will be seen that by my peculiar arrangement of the wheel N andits counterpart (l w th respect to the guide E such wheel and itscounterpart performtwo distinct functions, viz., creasing the cloth ormaterial, and so acting uponthe material as to crowd it toward the guideand keep its fold in contact therewith, whereby the line of creasingwill always be preserved in parallelism with the gauge and the line.

of feed.

I do not claim, broadly, a crease-forming device composed of a groovedwheel and a male counterpart, Neither do I claim so arranging the saiddevice that the line of bearing of the male die-creaser and the planeofrevolution of the said wheel shall be coincident and in parallelism withthe face of the cloth-guide. Nor

do I claim arranging the stationary or 'lower member of the creaser in aplane converging toward the clothguide and in the direction of the feedwhile the upper member has its plane of revolution and action on a planeparallel with such cloth-guide, as such arrange ment of parts is shownin Letters Patents No. 65,141, 7 4,323, and 89,492. Such arrangement ofthe part of the creaser will not attain the result produced by myinvention.

By repeated. experiment I have found that by arranging the male andfemale die-creasers in the same vertical plane and making such plane toconverge toward the cloth guide and in the direction of the movement ofthe material, a due compensation is obtained to ofi'set the saidinherent frictional action of the creasing device, and thusautomatically preserve the material in its normal path of movement.

Having described my invention,

What I claim is as follows:

1. The base-plate A B and its arm 0 with the adjustable wheel andedge-carrying devices, the edge and axle of the wheel being inclinedtothe face of the guide, and all combined and operating asand for thepurpose set forth.

2. The tuck-creasing apparatus above described, the same consisting ofthe base-plate A B, head-blook D, cam-lever K, guide 0', arm E, arm M,wheel N, slide D, male die-creaser d, and swinging apron E, combined andarranged together, substantially as above set forth.

CHAS. E. ROBINSON.

Witnesses:

FRANK G. PARKER, J AS. S. CoNANT.

